A lower inertial compact disk driving device is disclosed. The disk and laser head are static and optical unit device are used as a medium of the laser optical path. Furthermore, the focusing is realized. An optical unit device is used as a medium of the laser beam and a displacing device is used to change the position of the optical unit device. The focusing device has two rigid sliding tracks, one focus coil, and two permanent magnets. The rigid sliding tracks are used as a linkage. The focusing error from the laser beam passing through the optical unit device is converted into a focusing driving voltage which is applied to the focus coil so that a magnetic field is generated. This field is interacted with permanent magnets so that the focus coil moves up and down. Thereby, the rigid sliding tracks move up and down to drive the optical unit device to move.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A lower inertia compact disk driving device comprising: a displacing device having a rotary needle that controls rotation of an optical unit device, the displacing device also controls straight and reciprocal movement of the optical unit device for changing the position of incidence of a laser beam on a disk, said optical unit device is installed in the rotary needle as a transfer unit device for transferring the laser beam from the laser head, and a focusing device for driving the optical unit device to move slightly so that light contacts the disk precisely.
2. The lower inertia compact disk driving device as recited in claim 1 , wherein: the rotary needle is installed at a lower side of the disk and has a transverse groove and a hole at a center thereof, a lower side of the hole receives a gear that is integral to the rotary needle.
3. The lower inertia compact disk driving device as recited in claim 2 , wherein: rotation of the rotary needle is controlled by a rotation driving device that includes a driving motor and a gear, the gear being engaged with the gear integral to the rotary needle.
4. The lower inertia compact disk driving device as recited in claim 2 , wherein: the displacing device comprises: a hollow driving unit device installed at an inner edge of the hole, upper and lower ends of the driving unit device including gears, a gear at the upper end of the driving unit device being engaged with the two racks, and a servo motor engaged with a gear which is engaged with a lower gear of the hollow driving unit device to drive the movable reflector and the balance block to move in a straight and reciprocal motion.
5. The lower inertia compact disk driving device as recited in claim 1 , wherein: two ends of the rotary needle have light floating wheels that rotate continuously along the transverse central axis of the rotary needle.
6. The lower inertia compact disk driving device as recited in claim 5 , wherein: the rotary needle rotates on, and is in contact with, an annular device.
7. The lower inertia compact disk driving device as recited in claim 1 , wherein: the optical unit device comprises: a fixed reflector firmly secured to a center of the rotary needle, a movable reflector having a focusing lens for focusing the laser beam at a predetermined angle, and a balance block installed on the movable reflector to maintain balance of the rotary needle.
8. The lower inertia compact disk driving device as recited in claim 7 , wherein: two sliding rods have a T shape and pass through a movable plate and the transverse grooves of the rotary needle to enter into rigid sliding tracks.
9. The lower inertia compact disk driving device as recited in claim 8 , wherein: bottoms of the two movable plates have bushings which are engaged with the rotary needle.
10. The lower inertia compact disk driving device as recited in claim 7 , wherein: two movable plates are installed in racks which are formed at opposite sides of the movable reflector and the balance block.
11. The lower inertia compact disk driving device as recited in claim 1 , wherein: the focusing lens comprises: two rigid sliding tracks installed in an interior of the rotary needle that serve as moving tracks of a movable reflector and a balance block and as a linkage to control upward and downward displacement, one end of each of the two rigid sliding tracks is connected to a focusing coil, and another end of each of the two rigid sliding tracks is engaged with the reflector and sliding rods of the balance block, and a focus coil installed at a periphery of a hollow driving unit device of the rotary needle; wherein interaction of a magnetic field generated by the focus coil and a magnetic field of two permanent magnets causes upward and downward displacement of the focus coil so that the rigid sliding tracks are driven to move up and down, thereby focusing the movable reflector in real time.
12. The lower inertia compact disk driving device as recited in claim 11 , wherein: a lower side of the focus coil has four springs that provide a restoring force to the focus coil.
13. The lower inertia compact disk driving device as recited in claim 11 , wherein: the rigid sliding tracks have a C shape.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
January 29, 2002
August 24, 2004
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